Identify the correct statements with respect to secondary growth in dicot roots.

a. Vascular cambium arises from the parenchyma.
b. This secondary meristem is known as interfascicular cambium
c. The outer layer of pericycle gives rise to the phellogen.
d. Growth rings are well marked and distinct.

Question

TestHub · Accepted Answer

In dicot roots, the vascular cambium is completely secondary in origin, and it originates from a portion of pericycle tissue. (The pericycle is a cylinder of parenchyma or sclerenchyma cells that lies just inside the endodermis). Cork cambium or phellogen originates from the outer layers of cortex, epidermis and also from the pericycle. It gives rise to phellem or cork on the outer side and phelloderm or secondary cortex on the inner side.

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